13122221155 has 4 divisors (see below), whose sum is σ = 15746665392. Its totient is φ = 10497776920.

The previous prime is 13122221153. The next prime is 13122221173. The reversal of 13122221155 is 55112222131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13122221155 - 2¹ = 13122221153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13122221153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312222111 + ... + 1312222120.

It is an arithmetic number, because the mean of its divisors is an integer number (3936666348).

Almost surely, 2^13122221155 is an apocalyptic number.

13122221155 is a deficient number, since it is larger than the sum of its proper divisors (2624444237).

13122221155 is an equidigital number, since it uses as much as digits as its factorization.

13122221155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624444236.

The product of its digits is 1200, while the sum is 25.

Adding to 13122221155 its reverse (55112222131), we get a palindrome (68234443286).

The spelling of 13122221155 in words is "thirteen billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred fifty-five".